1. A. I. Agaryshev and N. N. Dasheev, “Methods for Solving Inverse Problems of Oblique-Incidence Sounding under the Conditions of Horizontally Inhomogeneous Ionosphere,” Issled. Geomagn. Aeron. Fiz. Solntsa, No. 85, 155–166 (1988).
2. B. G. Barabashov and G. G. Vetrogradov, “Dynamic Adaptive Model of Decameter Communication Channel,” Radiotekhnika, No. 12, 29–32 (1995).
3. T. V. Diogenova, M. K. Ivel’skaya, and V. E. Sukhodol’skaya, “Studies of Spatial Correlation of the F 2 Layer Critical Frequency,” Issled. Geomagn. Aeron. Fiz. Solntsa, No. 71, 74–78 (1985).
4. V. A. Golygin, V. P. Grozov, V. A. Sazhin, and V. E. Unuchkov, “Adaptation of the Ionospheric Model to Current Conditions Concerning Critical Frequencies without Special Measurements,” in Proceedings of the 4th Session of Young Scientists “Wave Processes in the Space Weather Problem”, Irkutsk, 2003, p. 200.
5. L. V. Pan’kov and V. E. Unuchkov, “Determining Maximum Applicable Frequencies from Measured Statistical Characteristics of Signals,” in Proceedings of the 14th All-Union Conference on Radio Propagation, Moscow, 1984, pp. 161–162.